package com.wc.AlgoOJ_train.train1.c0.A003;

import java.util.Scanner;

/**
 * @Author congege
 * @Description 计算球体积
 * http://43.138.190.70:8888/p/A003
 * @Date Created in 2023/12/24-21:20
 */
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double pi = 3.1415927;
        while (sc.hasNextDouble()){
            double r = sc.nextDouble();
            System.out.printf("%.3f\n",(4.0/3 * pi * Math.pow(r,3)));
        }
    }
}
